Accumulated Other Comprehensive Income (Amounts reclassified out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	$ 27	$ 206
Total before tax	(1,028)	556
Tax (expense) or benefit	(619)	25
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	27
Total before tax	27
Tax (expense) or benefit	(9)
Net of Tax	$ 18